![]() ![]() Therefore, a variety of electronic instruments are often used to measure distances that are too hard to reach or extremely long. Sometimes, however, it is not easy or physically possible to measure the actual distance between objects. For example, a typical pitched roof is usually made of wooden or steel trusses in the shape of triangles. Triangles are also used to define or calculate relationships between different parts of a structure. Engineers and builders use triangles frequently in the process of designing and constructing buildings and other structures. Amazingly, this characteristic is the reason why triangles are incredibly strong and often used in structures. Since a triangle must be closed, meaning all the sides meet another side at each endpoint, the sum of three angles of a triangle must be equal to 180°. In a triangle, each pair of sides forms an angle less than 180°. Trigonometry is the study of triangles and the relationship between their angles and sides.
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